Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .307 | 200gr | Frontier PH HPBT bullet and 67 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 and ReloadSwiss RS 80.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 90% | 58,378 psi | 90% | 2723 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 58,798 psi | 90% | 2743 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 57,290 psi | 88% | 2828 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 86% | 55,912 psi | 86% | 2759 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 58,088 psi | 89% | 2825 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 56,608 psi | 87% | 2799 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,982 psi | 82% | 2838 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,027 psi | 85% | 2815 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,086 psi | 86% | 2756 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,115 psi | 86% | 2746 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,477 psi | 85% | 2749 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 58,450 psi | 90% | 2818 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,246 psi | 87% | 2726 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,565 psi | 87% | 2799 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,058 psi | 88% | 2812 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 58,755 psi | 90% | 2887 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 49,893 psi | 77% | 2746 fps | 96.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 58,610 psi | 90% | 2782 fps | 98.7% |
| Bofors RP15 | <<locked>> | 92% | 57,609 psi | 89% | 2808 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 56,260 psi | 87% | 2808 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 58,450 psi | 90% | 2818 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 58,247 psi | 90% | 2818 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 57,276 psi | 88% | 2762 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,202 psi | 86% | 2746 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,159 psi | 86% | 2671 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,506 psi | 85% | 2877 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,579 psi | 58% | 1755 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 58,276 psi | 90% | 2733 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,259 psi | 85% | 2687 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,696 psi | 89% | 2743 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 56,405 psi | 87% | 2808 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,488 psi | 78% | 2740 fps | 99.6% |
| Lovex S065 | <<locked>> | 82% | 58,421 psi | 90% | 2707 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,898 psi | 88% | 2713 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,202 psi | 86% | 2697 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,840 psi | 86% | 2740 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 51,430 psi | 79% | 2762 fps | 100% |
| Norma MRP | <<locked>> | 88% | 58,697 psi | 90% | 2835 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,811 psi | 87% | 2726 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,508 psi | 89% | 2828 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 55,782 psi | 86% | 2733 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,014 psi | 86% | 2759 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,537 psi | 59% | 1798 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,609 psi | 89% | 2792 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,449 psi | 87% | 2867 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,869 psi | 86% | 2835 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 56,507 psi | 87% | 2730 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 55,172 psi | 85% | 2740 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 58,421 psi | 90% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,898 psi | 88% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,508 psi | 89% | 2667 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 58,566 psi | 90% | 2789 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 58,160 psi | 90% | 2720 fps | 99.6% |
| Somchem S365 | <<locked>> | 84% | 58,262 psi | 90% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,506 psi | 85% | 2710 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 58,363 psi | 90% | 2713 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,434 psi | 85% | 2694 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 58,421 psi | 90% | 2766 fps | 97.2% |
| Vihtavuori N550 | <<locked>> | 82% | 57,595 psi | 89% | 2720 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 58,421 psi | 90% | 2756 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 58,146 psi | 89% | 2838 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 94% | 58,784 psi | 90% | 2825 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 56,420 psi | 87% | 2835 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 98% | 57,566 psi | 89% | 2894 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,870 psi | 89% | 2664 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,202 psi | 86% | 2815 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,376 psi | 85% | 2707 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 41,698 psi | 64% | 2477 fps | 99.9% |
| Accurate 4350 | <<locked>> | 80% | 54,940 psi | 85% | 2694 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 43,047 psi | 66% | 2592 fps | 97% |
| ADI AR 2209 | <<locked>> | 80% | 45,672 psi | 70% | 2598 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 40,988 psi | 63% | 2543 fps | 97.5% |
| ADI AR 2217 | <<locked>> | 84% | 34,983 psi | 54% | 2408 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 96% | 45,788 psi | 70% | 2703 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 27,963 psi | 43% | 2264 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,050 psi | 71% | 2598 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,446 psi | 81% | 2697 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,614 psi | 70% | 2592 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,669 psi | 64% | 2549 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,350 psi | 62% | 2493 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,882 psi | 54% | 2438 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,571 psi | 70% | 2648 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 43,395 psi | 67% | 2635 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 98% | 46,137 psi | 71% | 2680 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 45,426 psi | 70% | 2569 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 38,754 psi | 60% | 2490 fps | 97.9% |
| Bofors RP30 | <<locked>> | 82% | 34,780 psi | 54% | 2425 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 41,669 psi | 64% | 2549 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 80% | 33,156 psi | 51% | 2365 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 43,482 psi | 67% | 2539 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,844 psi | 66% | 2526 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,284 psi | 76% | 2579 fps | 100% |
| Hodgdon Retumbo | 72.6 gr | 80% | 34,084 psi | 52% | 2467 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,166 psi | 43% | 1572 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,314 psi | 79% | 2635 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,764 psi | 80% | 2638 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,701 psi | 69% | 2536 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 80% | 39,668 psi | 61% | 2523 fps | 97.1% |
| IMR 8133 Enduron | <<locked>> | 88% | 33,402 psi | 51% | 2411 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 54,853 psi | 84% | 2661 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,374 psi | 82% | 2664 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,940 psi | 55% | 2365 fps | 99.1% |
| Norma 204 | <<locked>> | 80% | 52,083 psi | 80% | 2684 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 29,211 psi | 45% | 2320 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 44,121 psi | 68% | 2615 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 53,214 psi | 82% | 2677 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,566 psi | 61% | 2533 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 80% | 52,098 psi | 80% | 2680 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,607 psi | 55% | 2418 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,921 psi | 45% | 1611 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,635 psi | 83% | 2740 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 33,315 psi | 51% | 2444 fps | 98.2% |
| ReloadSwiss RS 80 | 84.2 gr | 86% | 38,029 psi | 59% | 2523 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 46,601 psi | 72% | 2572 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 80% | 45,092 psi | 69% | 2582 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,853 psi | 84% | 2661 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,374 psi | 82% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,693 psi | 83% | 2615 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,759 psi | 69% | 2575 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 47,529 psi | 73% | 2559 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 50,923 psi | 78% | 2635 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,672 psi | 70% | 2559 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 54,665 psi | 84% | 2667 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,798 psi | 61% | 2444 fps | 98.7% |
| Vihtavuori N170 | <<locked>> | 92% | 50,908 psi | 78% | 2654 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 54,056 psi | 83% | 2674 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,947 psi | 69% | 2566 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,874 psi | 68% | 2608 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 80% | 36,332 psi | 56% | 2434 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 86% | 39,276 psi | 60% | 2539 fps | 95.4% |
| Vihtavuori N570 | 86.6 gr | 92% | 46,195 psi | 71% | 2707 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,099 psi | 83% | 2621 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,087 psi | 59% | 2546 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,930 psi | 65% | 2493 fps | 98.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 67 powders for .300 Rem. Ultra Mag. loaded with the .307 | 200gr | Frontier PH HPBT. Vihtavuori N570 delivers the highest muzzle velocity at 2,894 fps; across all powders the maximum-charge window runs from 1,755 fps to 2,894 fps. ADI AR 2218 gives the best case fill at 100 %, and 67 of the 67 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.307" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-33 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Hodgdon Retumbo, Vihtavuori N570, ReloadSwiss RS 80 rank at the top here: for .300 Rem. Ultra Mag. with the .307 | 200gr | Frontier PH HPBT they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.